| 摘要 |
The present invention enables continuous measurement of engine exhaust gas while substantially eliminating the user's need to move a test chamber in which an engine is installed and replace a filter. According to the present invention, there are provided a first filter flow path 41 provided with a first filter 5, a second filter flow path 42 provided with a second filter 7, an exhaust gas analyzing part 3 for analyzing exhaust gas passing through the first filter 5 or the second filter 7, a flow path switching mechanism 9 for switching between the first filter flow path 41 and the second filter flow path 42, and a pulse purge mechanisms 10 for supplying purge gas to the filters 5, 7 in the filter flow paths 41, 42 in a pulsed manner, and in the case where a pressure difference between an upstream side and a downstream side of the filter provided in one filter flow path in which the exhaust gas flows becomes equal to or larger than a predetermined value, the one filter flow path is switched to the other filter flow path, and purge gas is supplied to the filter provided in the one filter flow path in the pulsed manner. |
